Problem with SDRAM Memory

Hi All

I have some problem with SDRAM memory interface. I'am using a SHARP LH79525
ARM controller.

when i give a precharge command i see with a logical analyzer a wrong comand

WE=L
CS=L
RAS=H
CAS=L
A10=H

whitch seem to be a write command

There are some configuration that can take a write command as precharge ?

Thanks
Ing Giuseppe Monteleone

Giuseppe Monteleone wrote:
> I have some problem with SDRAM memory interface. I am using a SHARP LH79525
> ARM controller.
>
> When I give a precharge command I see with a logical analyzer a wrong comand
>
> WE=L
> CS=L
> RAS=H
> CAS=L
> A10=H
>
> which seems to be a write command
>
> There are some configuration that can take a write command as precharge ?

No.  Are you sure you don't have RAS and CAS swapped?

Alan Nishioka
alan@nishioka.com